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19-09-2017
Mathematics

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20-(3x-9)-2=-(-11x+1)

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tropicaia tropicaia

19-09-2017

Answer: x = 2

Explanation
20 - (3x - 9) - 2 = -(-11x + 1)
20 - (3x - 9) - 2 = 11x - 1
20 - 3x + 9 - 2 = 11x - 1
20 - 2 - 3x + 9 = 11x - 1
18 - 3x + 9 = 11x - 1
+ 1 + 1
19 - 3x + 9 = 11x
19 + 9 - 3x = 11x
28 - 3x = 11x
+ 3x + 3x
28 = 14x
÷ 14 ÷14
2 = x

Check:
20 - (3(2) - 9) - 2 = -(-11(2) + 1)
20 - (6 - 9) - 2 = -(-22 + 1)
20 - (-3) - 2 = -(-21)
20 + 3 - 2 = 21
23 - 2 = 21
21 = 21 yes

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